/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

package proguard.optimize.info;

import proguard.classfile.ClassPool;
import proguard.classfile.visitor.ClassPoolVisitor;

/**
 * This ClassPoolVisitor repeatedly delegates to a given class pool visitor, as long as it keeps setting a given flag.
 *
 * @author Eric Lafortune
 */
public class RepeatedClassPoolVisitor implements ClassPoolVisitor {
    // *
    private static final boolean DEBUG = false;
    /*/
    private static       boolean DEBUG = System.getProperty("rcpv") != null;
    //*/

    private final MutableBoolean repeatTrigger;
    private final ClassPoolVisitor classPoolVisitor;

    /**
     * Creates a new RepeatedClassPoolVisitor.
     * 
     * @param repeatTrigger the mutable boolean flag that the class pool visitor can set to indicate that the class pool
     *        should be visited again.
     * @param classPoolVisitor the class pool visitor to apply.
     */
    public RepeatedClassPoolVisitor(MutableBoolean repeatTrigger, ClassPoolVisitor classPoolVisitor) {
        this.repeatTrigger = repeatTrigger;
        this.classPoolVisitor = classPoolVisitor;
    }

    // Implementations for ClassPoolVisitor.

    public void visitClassPool(ClassPool classPool) {
        // Visit all classes at least once, until the class visitors stop
        // setting the repeat trigger.
        do {
            if (DEBUG) {
                System.out.println("RepeatedClassPoolVisitor: new iteration");
            }

            repeatTrigger.reset();

            // Visit over all classes once.
            classPoolVisitor.visitClassPool(classPool);
        } while (repeatTrigger.isSet());

        if (DEBUG) {
            System.out.println("RepeatedClassPoolVisitor: done iterating");
        }
    }
}
